2iye | pdb_00002iye

STRUCTURE OF CATALYTIC CPX-ATPASE DOMAIN COPB-B

spinqualitylabelsall models 2iye, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2iye is a 2 chain structure with sequence from Sulfolobus solfataricus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 Activity: Hydrogen/potassium-exchanging ATPase, with EC number 3.6.3.10 Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The crystal structure of the catalytic fragment of a Sulfolobus solfataricus P-type ATPase, CopB-B, was determined with a 2.6 A resolution. CopB-B is the major soluble fragment of the archaeal CPx-ATPase CopB and is comprized of a nucleotide and a phosphorylation domain. In the crystalline state two molecules of CopB-B are in close contact to each other, although the presence of dimers in free solution could be ruled out by analytical ultracentrifugation. The overall architecture of CopB-B is similar to that of other P-type ATPases such as Ca-ATPase. Short peptide segments are linking the nucleotide binding to the phosphorylation domain. CopB-B exhibits 33% sequence identity (of 216 aligned residues) with the respective fragment of the Archaeoglobus fulgidus ATPase CopA. The CopB-B nucleotide-binding domain has the most primitive fold yet identified for this enzyme class. It is 24% identical to the nucleotide-binding domain of the disease-related Wilson ATPase ATP7B (80 structurally aligned residues). Structural superposition with Ca-ATPase suggests a putative nucleotide-binding site in CopB-B. The phosphorylation domain of CopB-B is structurally related to the corresponding part of Ca-ATPase in the anion-bound E2 state. In CopB-B crystals, a bound sulfate anion was identified at the phosphate-binding location. In solution state, the potential binding of CopB-B to phosphate was probed with (32)P(i). Bound phosphate could be readily displaced by orthovanadate at submillimolar concentration as well as by sulfate at millimolar concentration. It is possible therefore to assign the structure of the sulfate-bound phosphorylation domain of CopB-B to a state related to the E2.P(i) intermediate state of the catalytic cycle. Sulfate acts as phosphate analog on the monomeric catalytic fragment of the CPx-ATPase CopB from Sulfolobus solfataricus.,Lubben M, Guldenhaupt J, Zoltner M, Deigweiher K, Haebel P, Urbanke C, Scheidig AJ J Mol Biol. 2007 Jun 1;369(2):368-85. Epub 2007 Mar 20. PMID:17434529 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also ATPase

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